Bed and cylinder printing press



y 7, 1957 P. DIETRICH EI'AL BED AND CYLINDER PRINTING PRESS Filed May 12, 1951 INVENTOR: PAUL DIETRICH EMILKOLLANIJ 6} BY 4 FRITZ RuPP fi/JJW s.

United States Patent BED AND CYLINDER PRINTING PRESS Paul Dietrich, Emil Kolland, and Fritz Rupp, Augsburg,

Germany, assignors to Maschinenfabrik Augsburg- Nurnberg A. G., Augsburg, Germany, a corporation of Germany Application May 12, 1951, Serial No. 225,973

Claims priority, application Germany June 30, 1950 2 Claims. (Cl. 101-283) It is an object of the invention provide a particularly 7 stitf and rigid arrangement and thus quality of the prints.

With this and further objects in view, which will hereinafter appear, according to the present invention a knee to improve the or toggle lever mechanism is jointed to an eccentric lever for the impression cylinder, the stationary bearing of this knee lever being arranged on the side wall of the machine in such a way that the knee lever joints in the printing position are arranged in a straight line. Thus the two knee levers form a rectilinear stiff support resisting the pressure stress exerted by the cylinder upon the bed bearers and having no component of forces acting upon the control lever of the knee lever mechanism. The circuit of forces between the impression cylinder, the type bed, the machine frame, and the knee lever mechanism is of minimum length, more particularly if the stationary bearing of the toggle lever mechanism is arranged underneath the impression cylinder in the side wall of the machine. This design ofiers special advantages in connection with loosely rotatable mounting of the imp-ression cylinder on a shaft mounted in stationary bearings by means of eccentric journals so that the impression cylinder can be controlled in relation to the type bed by rotation of its shaft. In this case only one toggle lever mechanism is required at one side of the impression cylinder, since the movement of the eccentric lever is .unitfionnly transmitted also to the eccentric bearing in the other side wall of the machine frame through the shaft. This arrangement of the impression cylinder also contributes to the stitfness and rigidity of the cylinder bearing in relation to the type bed, and thus to the high quality of the prints.

The arrangement according to the present invention moreover ofiers a convenient possibility of adjusting the pressure exerted by the impression cylinder upon the bed bearers; to this end, according to a further feature of the invention, the stationary bearing of the toggle lever mechanism is eccentrically adjustable. Thus it is rendered possible to adjust the amount of contact pressure by a scale according to predetermined values.

Other and further objects, features and advantages of the invention will be pointed out hereinafter and appear in the appended claims forming part of the application.

In the accompanying drawing a now preferred embodiment of the invention is shown by way of illustration and not by way of limitation.

Referring to the drawing, the impression cylinder 1 is loosely rotatably mounted on a through shaft 2 which in its turn is rotatably mounted in the two side walls of the machine frame by means of two eccentric journals 3, so as to be rigid or unyielding with respect to the type "ice 2 bed except upon rotation of shaft 2 in journals 3. The type bed 25 reciprocated from side to side in the drawing beneath the impression cylinder 1 and is supported on the machine bed by the transverse support 26 and is driven in its reciprocating motion by the gear segment 27 operatively connected to the main printing press drive. Secured on one of the eccentric journals 3 is an eccentric rod or lever 4 to which is jointed one arm 5 of the toggle lever mechanism 5, 6, 7. The knee lever 6 bears at 8 on an eccentric in the side wall 24 of the machine, a handle 9 being provided for adjusting the contact pressure whose amount is indicated by an indicator 10 on a scale 11. For operation. of the toggle lever mechanism an arm 7 is provided having a recess 12 for engagement therein of the end 13 or a two-armed lever 15 pivoted on the stationary fulcrum 14. The two armed lever 15 bears at its opposite end a roller 16 controlled by a cam 17 rotating in a single-revolution rhythm, in such a manner that the knee levers 5, 6 can be moved firom the position shown in :full line, in which the three knee lever joints are disposed in a straight line and the impression cylinder is urged against the bed bearers, into the position shown in dot and dash lines in which no pressure is exerted.

In order to have the cylinder press run without pressure, ash is required, for instance, during passage of thepaper or other adjustment operations, the lever 7 may be removed from the position of engagement of its recess 12 with the end 13 of the two-armed lever 15 by operation of the rod 18 through the handle 20 of the twoarmed lever 19 operating on a rod 18 jointed to lever '7. The handle 20 can be engaged in a recess 2?. of a gate 21 in the operative position of lever 7, or in a recess 23 of gate 21 in the released position of lever 7.

While the invention has been described in detail with respect to a certain now preferred example and embodiment of the invention it will be understood by those skilled in the art after understanding the invention that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended, therefore, to cover all such changes and modifications in the appended claims.

What is claimed is:

1. In a throw-off mechanism for a printing press having an oscillating type bed and an impression cylinder adapted to 'be pressed intermittently against said type bed and mounted for free rotation about a shaft extending across said press, the combination which comprises eccentric journals for mounting said shaft in said press providing for moving said cylinder against and away from said type bed upon rotation of said shaft in said eccentric journals, a single two-link toggle at one side of said press, means for pivot-ally connecting one end of said toggle to said press, means for pivotally connecting the other end of said toggle to one end of said shaft effecting rotation of said shaft upon straightening and collapsing of said toggle, said two links of said toggle being pivotaily interconnected and disposed to extend aligned with each other and in opposite directions when said toggle is straightened and not collapsed, lever means pivotally connected to toggle at said pivotal interconnection of said two links thereof for straightening and collapsing said toggle in timed relation with the operation of said press effecting moving said cylinder against and away from said type bed upon rotation of said shaft by said toggle, said two links of said toggle being aligned in rigid straightened oppositely extending dead-center position when said cylinder is against said type bed forming a rigid member resisting deflection of said cylinder from said type bed by printing pressure therebetween, and said means for pivot-ally connecting one end of said toggle to said press being disposed substantially in the plane of the axis of of said cylinder and being adjustable along a line longitudinally of said toggle in said;straigh-tened position thereof for adjusting the printing vpressure-with which said .cylinder is urged against said .typeibedby said toggle.

2. In a throw-off mechanism fors-a printing press having an oscillating type bed and an impression cylinder adapted to be pressed intermittently against said typebed and mounted for free rotation about a shaft extending across said press,.thecombination.whichcoinprises eccentric journals for mounting said shaftdn said press providing for moving said cylinder against andawa-y fromsaid type bed upon rotation of said shaft in said eccentric journals, a single tworlink toggle at one side of said press, means for pivotally connectingone end of said toggle to said press,,meansrfor pivotally connectingthe other end of said toggle to oneend of said shaft efiecting rotation of said shaft upon straightening and collapsing of said toggle, said two links of said toggle being pivotally interconnected and disposed to extendlaligned with each other and in opposite directions when said toggle is straightened and not collapsed, cam andcam followerrneans operating in timed relation with the operationof said press, a linkage connecting said cam and cam follower means ;to said toggle at said pivotal interconnection .ofsaid .two links thereof for straightening and collapsing said toggle effecting moving said cylinder against and away from said type bed upon rotation of said cylinder shaft ,by said toggle as driven by said cam and cam follower means, means in said linkage between said cam follower and said toggle for selectively disengaging said cam and cam follower means from said toggle to interrupt said moving of said cylinder during continued operation of said cam and said cam follower means, said two links of said toggle being aligned in rigid straightened oppositely extending dead-center position when saidcylinder is against said type 'bedforming a rigid member resisting deflection of said cylinder from said type bed by printing pressure therebetween, and means for pivotally connecting one end of said toggle to said press beingdisposed substantially in the plane of the-axis of said shaft and substantially adjacent the circumference of said cylinder and being adjustable alonga line longitudinally of said toggle in said straightened position thereof for adjusting the printing pressure with which said cylinder is urged against said type bed by said .toggle.

References Cited in thefilc of this patent UNITED ST AIES ,PATENTS 876,132 Bechman "a Jan. 7, 1908 1,816,796 ,Rossger July 28, '1931 2,043,056 Mueller .June 2, 1 936 2,051,376 Hernlund et a] Aug. 18, 1936 2,146,963 Lang Feb. 14, 1939 2,209,482 Stobb July 30, 1940 2,556,251 Bell .a June 12, 195l FOREIGN PATENTS 7432,25 7 Germany J y 192 

